noun
Colloquial term for insects that emit a foul smell when threatened, especially the bombardier beetle. Often used by children or in casual speech.
庭でへこき虫を見つけた。
I found a stink bug in the garden.
へこき虫は、危険を感じると臭い液を出す。
When a bombardier beetle senses danger, it releases a smelly liquid.
Compound of 屁 (へ, 'fart'), 放き (こき, continuative form of 放く 'to release'), and 虫 (むし, 'bug'). Literally 'fart-releasing bug', referring to the insect's defensive odor.